Plutonium

This is becoming a big problem, but I've already discovered the source of the problem, I just don't know how to solve it.
I bought a new PC and the same problem occurs, so I tried creating a new Plutonium account, but that didn't solve it either.
I installed BO2 from the Fitgirl website and started the game in campaign mode. The problem doesn't happen, the movement is perfect. Then, I configured the Plutonium launcher to load the game through the folder installed by Fitgirl and the error occurs again. The problem is with Plutonium!

I don't know how to solve this because my new PC has exactly the same error as the computer where I recorded the gameplay.
I just tried the solution you gave me and it didn't work. I would like to be able to continue playing BO2, but if there is no solution to this problem, I will have to stop

Hey guys,

I've been having a problem lately playing Black Ops 2 on Plutonium. Something is strange when I jump with my character; if I try to change direction after a jump, it gets stuck, especially if I go backward.

To give some context:

I've played BO2 on Plutonium before and never had this problem, including playing BO2 installed from the FitGirl website, and there was no problem there. It happens in both multiplayer and zombies modes and has been happening for about a year. I don't know how to solve it.

I've already tried:

• Restoring my PC to factory settings and reinstalling everything.
• Changing the FPS limit to 60, 120, 144, 200, Unlimited.
• Disabling vertical sync on the video card.

None of the solutions worked.

My computer has:
AMD Ryzen 7 3800X 8-Core Processor
2x16.0 GB 3600MHz
RTX 2060 Super
Samsung 990 PRO 2TB SSD

I really need help, I can't solve the problem and this makes it very difficult to play, especially in zombies mode, since I can't move backwards!

One of my friends couldn't join at my and other player session, so the problem was with my friend. We try all the solucions that we found here but what he did to fix that problem was reinstall the plutonium.exe launcher. For some reason his plutonium didn't let him join us. So go at plutonium download site, download button and maybe it can fix your problems.